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by Billy
Tue May 02, 2017 12:27 am
Forum: Bismarck General Discussion
Topic: 38 cm shells
Replies: 42
Views: 8187

Re: 38 cm shells

Firstly - that it turns out that British and American shells were not that similar - you are actually right. However that greater performance at NORMAL impact of British shells only serves to camoflage the inferior American armour as it gives more penetration when penetrating superior British armour...
by Billy
Mon May 01, 2017 11:47 pm
Forum: Bismarck General Discussion
Topic: 38 cm shells
Replies: 42
Views: 8187

Re: 38 cm shells

And also lets not forget accuracy. Also a not too mentioned topic. If you cant hit the target then what good is muzzle energy. From all accounts the 14 in was accurate. Although I do still really believe that the 38/52 is very underated. People say its got a light shell BUT it turns out that armour ...
by Billy
Mon May 01, 2017 11:11 pm
Forum: Bismarck General Discussion
Topic: Yaw deck?
Replies: 12
Views: 1172

Yaw deck?

The top deck of American battleships was sometimes officially known as the yaw deck. There has been much debate over the function of yawing a heavy projectile. Some people saying of course it does others decrying the notion and refer to it as normalising, where the shell direction is slightly differ...
by Billy
Mon May 01, 2017 10:44 pm
Forum: Naval Weapons
Topic: American SH shells - Famed or Folly
Replies: 9
Views: 920

American SH shells - Famed or Folly

The use of the Very heavy 2700 lb shells have been vaunted over the years. And looking at it it has allot going for it. 1. Resonably good initial velocity - 2500fps ( for the 50 ) and awesome momentum energy values. 2. Excellent velocity retention at range. 3. Excellent deck penetration values at lo...
by Billy
Sat Apr 11, 2015 7:14 pm
Forum: Naval Technology
Topic: Brittle Fracture and torpedo resistance
Replies: 6
Views: 2040

Re: Brittle Fracture and torpedo resistance

Hi there. I sorry I've been away for quite a while. Anyway what I forgot to include was the said article for ductile brittle transition to occur under impact starts at 15 C. Then the strength of the steel declines linearly from 160 Nm all the the way down to 15 Nm at 5 C. So the colder the worse it ...
by Billy
Wed May 15, 2013 5:08 pm
Forum: Bismarck General Discussion
Topic: 38 cm shells
Replies: 42
Views: 8187

Re: 38 cm shells

To Thoresten thanks, but what I meant was that given the British shells known advantage at normal incidence and the angle of fall at that range would still be very close to normal (around 10deg ) so the advantage would still apply as the penetration values only equaled out at around 30 deg. To Dave,...
by Billy
Sun May 12, 2013 2:56 pm
Forum: Bismarck General Discussion
Topic: 38 cm shells
Replies: 42
Views: 8187

Re: 38 cm shells

Thanks Thorsten for the info, much appreciated. Although also I never added in any of the advantage at normal incidence and penetration tables are calculated for normal incidence at the range specified. This would make up for any small discrepancies and push it up around or over the 25% value. From ...
by Billy
Sun May 12, 2013 2:22 pm
Forum: Naval Technology
Topic: Battleship Vanguard Armor
Replies: 65
Views: 40949

Re: Battleship Vanguard Armor

Hi Dave sorry about the type-o. I meant to say the deck. Although this may have reduced damaged stability. Have you seen the config on the G3s. What do you think.
by Billy
Sat May 11, 2013 11:56 pm
Forum: Bismarck General Discussion
Topic: 38 cm shells
Replies: 42
Views: 8187

Re: 38 cm shells

Sorry forgot to add, at the range in question ie 13700 yards, the relative velocities of the projectiles in question are, 541.8 mps (1774 fps) for the British 723.5 kg (1595 pound) projectile and 565 mps (1853 fps) for the American 680.6kg (1500 pound) projectile. Now if you use the equation 1/2mv2 ...
by Billy
Sat May 11, 2013 10:14 pm
Forum: Bismarck General Discussion
Topic: 38 cm shells
Replies: 42
Views: 8187

Re: 38 cm shells

To Thorsten Wahl. The test in question was conducted at the U.S. Proving grounds. As I don't think they actually shipped an entire British gun over they would have performed the test in an American gun with more than likely identical charges, since it is the same chamber, probably even using the sam...
by Billy
Sat May 11, 2013 9:59 pm
Forum: Bismarck General Discussion
Topic: 38 cm shells
Replies: 42
Views: 8187

Re: 38 cm shells

Found an amazing web site called Bismarck battle film analysis. An actual film of the battle that has been authenticated and would strongly recommend you guys look it up. It shows a number of things, namely Bismarck firing her forward turrets at intervals of 25 and 27.5 sec during the battle and tha...
by Billy
Sat May 11, 2013 11:24 am
Forum: Naval Weapons
Topic: Plunging fire
Replies: 18
Views: 8178

Re: Plunging fire

The German cap was a fair bit heavier than its British counterparts. I would find it very unlikely that they would have used old ww1 armor in tests since the newer armor had been around for some time by them. However could it be that the German figures were correct (especially regarding German tradi...
by Billy
Sat May 11, 2013 9:49 am
Forum: Bismarck General Discussion
Topic: 38 cm shells
Replies: 42
Views: 8187

Re: 38 cm shells

Hi Paul, I got the info from Axis and neutral battleships of WW2, which gives quite a facinating and well researched account of the battle. It refers to Hood being struck by the 4th salvo, but I know other sources quote the 5th salvo.
by Billy
Fri May 10, 2013 5:10 pm
Forum: Naval Technology
Topic: Brittle Fracture and torpedo resistance
Replies: 6
Views: 2040

Brittle Fracture and torpedo resistance

I found this rather interesting statement in the the book "Introduction to engineering materials" it reads. "Mild steel is ductile at low strain rates at all temperatures above a value of about -170 deg C, but when mild steel is subjected to impact loading conditions the transition fr...
by Billy
Fri May 10, 2013 4:10 pm
Forum: Naval Technology
Topic: Battleship Vanguard Armor
Replies: 65
Views: 40949

Re: Battleship Vanguard Armor

She looks to me like a beautifully balanced design, which incorporated many improvements over KGV that made her greater than the sum of the individual parts and far better. She was a better sea boat as well as faster and better able to absorb damage(damaged stability was rather good), never mind qui...

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